Function

A function is a block of organized, reusable code that is used to perform a single, related action
A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function.
The function is a set of programmatic statements that take some input, do some specific calculation and computation and produce expected output and return it.
Create a function and add some commonly repeated code inside it. that instead of writing the same code again and again for different inputs, we can call the function

Function blocks begin with the keyword def followed by the function name and parentheses ()
if Any input parameter placed with parentheses.
The code block within every function starts with a colon (:) and is indented.
for returning value from the function you can use the return keyword

return "element to return"

Syntax:

def functionname(parameters):
    #Add main computation code here

Example:

def sum(a,b):
    return a+b

Once the basic structure of a function is finalized, you can execute it by calling it from another function or directly from the Python prompt
Call a function after the only declaration of function.if you called a function before its declaration python interpreter gives an error(name 'function' is not defined) Example:

a=5
b=7
print(sums(a,b))
def sums(a,b):
    return a+b

Output:

NameError: name 'sums' is not defined

The correct way to Write a function

Example:

a=5
b=7
def sums(a,b):
    return a+b
print(sums(a,b))

Output:

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